水耕におけるリン施用量がキクの生育とリン吸収量に及ぼす影響
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The relationship between phosphorus (P) uptake and growth rate of chrysanthemum plants grown hydroponically for cut flowers was investigated.<BR>In Exp. 1, fresh weight increase of chrysanthemum cv. Seiun plants at flower budding phase administered 0 to 40 ppm in culture solution for 16 days was evaluated. <BR>1. P uptake by the chrysanthemum plants was nearly proportionate to P concentration in the culture solution. <BR>2. The rate of increase in fresh weight of plants was not affected by the P concentration in the range of 20 to 40 ppm. <BR>In Exp. 2, to determine the optimum amount of P uptake for marketable cut flowers in chrysanthemum cv. Otomezakura, 50, 100 and 200 mg P per plant were applied at planting time. In another plot, 20 ppm P in culture solution was adjusted weekly by adding an equivalent amount of P absorbed by plants. <BR>1. In the 50 mg P plot all P was absorbed by plants within 5 weeks after planting. The plants in this plot showed P deficiency symptom and delayed flowering. Although the phosphorus in the 100 mg P plot was wholly absorbed at within 7 weeks after planting (3 weeks before flowering), the plants grew and flowered normally. <BR>2. Plants in both 200 mg P and 20 ppm P plots exhibited P excess symptom in the middle and lower leaves, e. g., chlorosis and pale green colour. <BR>3. The rates of fresh weight increases in the four P plots were almost similar; their fresh weights were not significantly different at the end of the experiment. <BR>4. The leaves of plants which absorbed up to 190 mg P and showed P excess symptom contained 0.51 to 0.70% P on dry weight basis, whereas leaves of plants which absorbed 50 mg P and showed P deficiency symptom contained 0.13 to 0.18% P.
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